Relating to alternating-current dynamos.



M. BRESLAUER] RELATING TO ALTERNATING CURRENT DYNAMOS.-

APPLICATION FILED MAR. 9, I914. 1,248,255. Patented Nov. 27, 1-917.

7 SHEETS-SHEET I. E- g g- 119 Witnesses l Q I MBTeSZa/wafi f [n ZrahZ'or APPLICATION FILED MAR. 9, I914- Patented Nov. 27, 1917.

2 SHEETS-SHEET 2- es ZazLe'r,

r n n m w m/ym MAX nnnsnaunn, or HOPPEGABTEN, NEAR BERLIN, GERMANY.

RELATING TO ALTERNATING-CURRENT DYNAMO S.

Specification of Letters Patent. P tented, Nov, 27, 1917,

Application filed. March 9, 1914. Serial No. 823,611

To all whom it may concern.

Be it known that 1, MAX BRESLAUER, a, subjectof the German Emperor, residing at Hoppega-rten, near Berlin, Germany, have invented certain new and useful Improve larly to a machine for the production of.

high frequency alternating current such as is specially adapted for use in connection with wireless telegraphy and other like purposes. I i

In the previously known machines for this purpose, it is found that many disadvantages exist, due to the rapidity of the changes I in the magnetism of the iron parts, caused by the setting up of eddy currents and the phenomena of hysteresis. Attempts to over come these advantages have been made by way of subdividing the iron into thin plates or laminae, but have been unsuccessful.

The present invention overcomes these disadvantages by arranging the armature winding so that it comprises essentially a full pole pitch, the middle line at right angles to the plane of the winding being arranged in the equatorial plane between the armature poles. By means of this arrange ment the changes of magnetism in the iron, as comparedto the number of synchronous or fundamental cycles in the current pro duced, are greatly reduced whereby the number of cycles Will be a multiple of the changes in magnetism.

In the accompanying drawing different embodiments of the invention are diagrammatically illustrated, and

Figures 1 to 1 illustrate the magnetic flux in successive stages in the rotation of the armature in a two pole machine.

Fig. 2 is diagram showing the variations in the magnetic flux corresponding to such stages.

Fig. 3 is a diagram showing the voltage curve corresponding thereto.

Figs. 4P to 4* are diagrams illustrative of the magnetic flux in a modified form of the invention.

Fig. 5 is a flux diagram corresponding to the views showing the modification.

Fig. 6 is a diagram showing the voltage curve of the modification.

In the several views the north and south poles of the field magnet are indicated at and S respectively. Between these poles revolvesan armature 10 having sides A and B and constructed in the usual mannerof sheet iron laminae and provided with the usual polepieces and around, this armature is disposed the winding 11 which, in the two pole type shown, coincides with the axial plane passing through the centers of the poles.

With such construction it will be seen that, with the armature in the position shown in Fig. 1, the number of lines of magnetic force passing through the coils of the win ding is practically zero with resultant conditions shown in the flux and voltage curves of Figs. 2 and 3 at a. As the ar mature revolves to the position shown in Fig. 1 the lines of magnetic force will pass diagonally through the coils, from side A to side B increasing in number until the plane of the winding extends between the opposite corners of the poles N and S. At this time the magnetic lines of force which pass through the coils of the winding will be the maximum number, the conditions being shown at b in Figs. 2 and 3. The number of lines of magnetic force which pass through the coils of the winding will, by continued rotation of the armature, gradually decrease until the position shown in Fig. 1 is reached. At this position all the lines of force will be parallel to the plane of the windings and consequently the number passing through will be zero. Moreover this condition will continue through the stages shown in Figs. 1 and 1 with corresponding zero indications in the flux and voltage curves. As the armature passes from the position of Fig. 1 to that of Fig. 1 the lines of force passing through the coils will gradually increase in number until the maximum is reached at the latter position, but it is to be noted that the lines of force now pass from side B of the armature to side A so as to produce the curve e-f of the diagrams. In like manner the lines of force decrease gradually as the armature moves to the position shown in Fig. 1' with corresponding flux and voltage curves. This completes one half revolution of the armature.

It will be observed that, under these conditions the magnetic flux becomes zero as soon as the armature pole pieces come fully opposite the N and S poles of the field and remains zero until these armature pole pieces begin to pass off of the field poles. Owing to this the voltage curve remains zero for appreciable periods of time, which in some instances becomes a serious detriment.

In order to overcome this, it is merely necessary that the pole pieces of the armature be made substantially equal in extent to the poles of the field. The resultant action of the lines of force and the flux and voltage curves are clearly shown in Figs. i to 4k and 5 and 6, the interpretation of which will be obvious from the previously given interpretation of, Figs. 1 to 3.

It is to be particularly noted that, under these conditions, the voltage curve approaches the sinusoid, the curve passing in stantaneously from one side of the zero line to the other.

It will be seen that the above arrange ments give twice the number of alternations in voltage as the number of changes in the magnetic flux.

hat I claim is:

1. In an alternating current dynamo a field structure, an armature adapted to re- Gopies of this patent may be obtained for volve in said field structure and having projecting poles and conductor windings, said winding comprising essentially a full pole pitch and so arranged on the armature, that the middle line at right angles to the plane of the windings is displaced relatively to the middle line of the projecting poles of the armature by essentially one half pole pitch.

2. In an alternating current dynamo a field structure, an armature adapted to revolve in said field structure and having projecting poles and conductor windings, said winding comprising essentially a full pole pitch and so arranged on the armature, that the middle line at right angles to the plane of the windings is displaced relatively to the middle line of the projecting poles of the armature by essentially one half pole pitch, thesize of the pole arcs of the field structure being essentially equal to that of the pole arcs of the armature.

I11 testimony whereof, I ailix my signature, in presence of-two witnesses.

MAX BRESLAUER.

WVitnesses WVOLDEMAR HAUPT, HENRY HASPER.

five cents each, by addressing the Commissioner 0! Patents, Washington, D. 0. 

